How to get rid of iCloud pop ups on my computer

Hello gopher54,

Thank you for reaching out to Apple Support Communities, and we'll be happy to help in any way we can. We understand you're having issues with iCloud pop-ups on your PC. What exactly do they say?

To help with this, please uninstall the iCloud for Windows software and reinstall a fresh copy as shown in the related article at the top of the page:

Turn off or uninstall iCloud for Windows

If you turn off a service in iCloud for Windows, your information won't automatically stay up to date in iCloud, and you won't see updates made on your other devices. Follow these steps to turn off a service or iCloud:

To turn off a service on your PC, Open iCloud for Windows, then select or deselect that service. To save your changes, click Apply. 

To turn off iCloud for Windows, open iCloud for Windows, then sign out. 

If you want to uninstall iCloud for Windows, remember to make a copy of your iCloud data and save it on your PC. Then sign out of iCloud for Windows on your PC, and follow these steps:

Windows 8 or later:

Go to the Start screen, right-click in the bottom-left corner or click, then select Control Panel.

Click Uninstall a Program.

Click iCloud > Uninstall.

When asked to confirm, select Yes.

Windows 7:

Choose Start menu > Control Panel.

Click Programs > Program and Features.

Select iCloud > Uninstall.

Click OK to continue.

We hope this helps.

Cheers!